Composition for production of lyophpobic graphitic material

FIELD: power industry; petrochemical industry; metallurgy; municipal services and other branches of economy; production and use of sealing materials.

SUBSTANCE: the invention is pertaining to the composition for production of the lyophobic graphitic materials, in particular, to production of composite materials used for grease seals predominantly ensuring potting of "stock-body" type mobile and stationary "body-cover" joints of the pipeline fittings used in power industry, petrochemical industry, metallurgy, municipal services and in other branches of economy. The composition contains the following components( in mass %): 70-90 - black leads, 1-3 - low molecular weight polyethylene of a molecular mass 150-300, 2-7 - sodium silencer, 1-2 - sodium nitrite, 3-6 - top-finished carbon fibers, 2-7 - suspension of polytetrafluoroethylene at a ratio of polytetrafluoroethylene to water of 1:10, 1-5 - glycerin. The invention ensures a high wear-resistance of articles due to a decrease of metallic components corrosion.

EFFECT: the invention ensures a high wear-resistance of articles due to a decrease of metallic components corrosion.

 

The invention relates to a sealing technique, and more particularly to the production of composite materials for seals, mainly ensuring the sealing of moving "rod-building" and "motionless body-cover" connections valves used in power engineering, petrochemistry, metallurgy, utilities and other industries.

The peculiarity of the seals of the specified type is operation under conditions of elevated temperature and pressure to which the material should have a high elastic properties, high damping capacity, hydrophobicity and resistance to corrosion.

The most common method of increasing thermal stability of the materials is the introduction into the composition of the graphite. For example, in known graphitized composition [RF Patent №2115669, MPK7: F 16 N 15/02, bull. No. 10, 1999] along with graphite is polytetrafluoroethylene (PTFE) and phenol-formaldehyde resin as a binder. However, the performance of products made from this composition are not so much concerned with its composition, how to conduct unproductive technological operations in the processing composition in the product.

Known graphitized composition for sealing [RF Patent №2128801, MPK7: F 16 N 15/02, bull. No. 10, 1999], along with graphite, PTEF and fenolformaldehyde Noi resin further comprises talc and methenamine. However, the original charge material to create a composition is so diverse, the item and the original fractional state, which inevitably leads to the production of composite material with extremely varied performance characteristics. In addition, the products of known composition are characterized by low wear resistance.

The closest to the material obtained from the inventive composition is graphitized composition [USSR Author's certificate No. 1810384, MPK7: 10 M 163/00, With 10 M 125/02, 1991 (prototype)], which, along with graphite as a powder filler further comprises a low molecular weight polyethylene, hydrocarbon condensate separation stage in the production of high-pressure polyethylene in the following ratio, wt.%: graphite - 3...30; low molecular weight polyethylene - 5...25; specified hydrocarbon condensate to 100 (prototype).

However, despite a number of advantages specified composition, it has a relatively low load capacity, especially at high sliding speeds and high temperatures. In addition, the inherent low hydrophobicity due to the adsorption of liquid, high coefficient of friction and low wear resistance caused by corrosion of metal e the elements of the locking position of the seals.

The present invention is to increase the wear resistance of products from Lifeblog graphitized material by reducing corrosion of metal elements.

The problem is solved in that the composition for obtaining Lifeblog graphitized material includes as a basis graphite and low-molecular-weight polyethylene molecular weight of 150-300, while additionally contains sodium acid, sodium atomistically, carbon fiber, brushed suspension of polytetrafluoroethylene with a ratio of polytetrafluoroethylene to water of 1:10, and glycerin in the following ratio, wt.%:

Graphite70-90
Low-molecular-weight polyethylene
molecular weight of 150-3001-3
Sodium acid2-7
Sodium atomistically1-2
Carbon fiber3-6
Suspension of polytetrafluoroethylene2-7
Glycerin1-5

Composition to obtain Lifeblog graphitized material is prepared as follows. Prepare aqueous suspension of PTFE with a ratio of PTFE 1 part to 10 parts of water and injected into not melkorublenoy carbon fiber. In graphite injected low-molecular-weight polyethylene and placed in an oven. Then carry out the heating of the composition in an oven to 300°followed by exposure for 1 hour. After removal from the furnace enter the acid solutions of sodium and azotistogo sodium in the ratio of 2:1, and carbon fiber in suspension PTFE. The composition is thoroughly mixed. Because glycerin has a melting point 178°With, it is introduced as cooling of the mixture to the specified temperature, continuing the stirring mixture. During mixing, the moisture from solutions of acid, azotistogo sodium and PTFE suspension is evaporated and the dried particles of the latter is evenly distributed throughout the structure of the material. The obtained powder material is processed into a product of cold pressing method.

The introduction of the material azotistogo sodium is achieved protection of the counterface material (steel) corrosion at temperatures up to 270°and at higher temperatures the corrosion protection is provided by acid sodium with a higher decomposition temperature. The necessary concentration of the corrosion inhibitor depends on the operating conditions, the composition and properties of the liquid. The presence of glycerol stabilizes the elastic characteristics of the material and prevents the product from drying out during the whole time of storage and operation. Chopped carbon fiber, brushed PTFE, significantly increases the damping capacity of the material, and also improves strength and anti-friction properties. In addition, the fine carbon fiber in combination with acid and atomistically sodium increases the resistance of the organic components to oxidation at elevated temperatures. The formulations of the material are given in table 1.

Table 1

The composition of the material
ComponentsContent, wt.%
1The inventive composition5
234
Graphite9590857065
Low-molecular-weight polyethylene11234
Sodium acid NaSi2About512278
Sodium atomistically

NaNO2
11124
Carbon fiber13 366
The PTFE suspension (1:10)12477
Glycerin SNON (CH2OH)2-1356

Friction materials testing was performed on machine friction SMC-2 scheme per partial insert. As the shaft used steel roller 45, the surface roughness Rand=0,8-1,0 mm. Compression testing was carried out according to GOST 23775-79 on samples with a diameter D=36 mm and height h=20 mm Increase in weight when exposed to water and oil was determined according to GOST 4650-80.

Values of the friction coefficient, wear rate, increase the weight when exposed to water and oil for a known material and material derived from the proposed composition shown in table 2.

As follows from the data in table 2, lifornia antifriction material based on graphite made from the inventive composition has a higher performance in comparison with the known composition. The attrition rate of compounds 1 and 5 corresponds to the intensity of wear of known composition.

Table 2

Properties of materials
IndicatorsMaterials
1The inventive composition5Prototype [3]
234
The coefficient of friction0,110,070,080,090,120,12-0,15
(pressure P=5·104N/m2,
speed ν=0.5 m/s)
Wear,2,51,01,50,82,82,5-3,0
µm/km P=5·104N/m2,
ν=0.5 m/s)
The increase in the mass when the who-
astii, %, not more:
- water0,200,100,090,090,100,40
butter0,160,080,080,070,070,32

Sources of information

1. RF patent №2115669, CL F 16 N 15/02, bull. No. 10, 1999

2. RF patent №2128801, CL F 16 N 15/02, bull. No. 10, 1999

3. USSR author's certificate No. 1810384, CL 10 M 163/00, With 10 M 125/02, 1991 (prototype).

Composition to obtain Lifeblog graphitized material including as the basis graphite and low-molecular-weight polyethylene molecular weight of 150-300, characterized in that it additionally contains sodium acid, sodium nitric acid, carbon fiber, brushed suspension of polytetrafluoroethylene with a ratio of polytetrafluoroethylene to water of 1:10, and glycerin in the following ratio, wt. %:

Graphite70-90
Low-molecular-weight polyethylene
molecular weight of 150-3001-3
Sodium acid2-7
Sodium and otisco acid 1-2
Carbon fiber3-6
Suspension of polytetrafluoroethylene2-7
Glycerin1-5



 

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